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Longhorn Man · 12-02-2010, 07:48 PM

if your engine does not have hardened exhaust seats, then a lead substitute will help, but it'll take many many years to damage them if you skip the lead additive. Plus, in many areas, lead substitutes are very hard to find.
Mid range fuel... throwing money out the tail pipe if the engine doesn't need it.
oil additive... new oils (including diesel oils) don't have the zink needed to keep old engines alive. ZDDP additive IS HIGHLY recomended.

12-02-2010, 07:48 PM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: fuel octane/additives if your engine does not have hardened exhaust seats, then a lead substitute will help, but it'll take many many years to damage them if you skip the lead additive. Plus, in many areas, lead substitutes are very hard to find. Mid range fuel... throwing money out the tail pipe if the engine doesn't need it. oil additive... new oils (including diesel oils) don't have the zink needed to keep old engines alive. ZDDP additive IS HIGHLY recomended.